C# DotNet Interview Preparation - Part 11

Question 61: What is the difference between string and StringBuilder in C#?

Answer:

• : Immutable (creates a new object on modification).

• : Mutable (modifies the same object, better for performance when modifying strings frequently).

Code Example:

Question 62: What is the difference between readonly and const in C#?

Answer:

Feature Value Assignment Assigned in constructor or declaration Must be assigned at declaration Modification Can be changed in constructor Cannot be changed after declaration Runtime or Compile-time? Runtime constant Compile-time constant

Code Example:

Question 63: What is the difference between Dispose() and Finalize() in C#?

Answer:

• : Explicitly called to release unmanaged resources ().

• : Called by the Garbage Collector before the object is destroyed.

Code Example:

Question 64: What is the difference between throw and throw ex in C#?

Answer:

• : Preserves the original exception stack trace.

• : Resets the stack trace (not recommended).

Code Example:

Question 65: What is yield return in C#?

Answer: " allows returning elements one by one without creating a collection in memory."

Code Example:

Question 66: What is the difference between Array and Listlt;Tgt; in C#?

Answer:

Feature Size Fixed Dynamic Performance Faster (fixed size) Slightly slower (resizable) Methods Limited Rich API (, , etc.)

Code Example:

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